The series has gone downhill ever since the transition from Call of Duty 4 - Call of Duty: World at War, ever since then it has got worse and worse. Call of Duty is becoming boring coming out every year, maybe take at least a 4 year gap between each
developers games[Infinity Ward 2011, Treyarch 2014, and then back to Infinity Ward in 2016, its getting borning having the same game every year repacked as a 'new' title

Activition are well known now for milking games, they have done the exact same thing with the Tony Hawk francise, Tony Hawks used to be good until they braught one out every year, the same goes for WWE games, I predicted this would happen to Call of Duty
after WaW because of what they have don to the once great Tony Hawks and WWE games!

Some people max out prestige and get bored of the game. Activision has obviously found that a new game a year = maximum sales, and since the developers switch off they still get a full two year development cycle. Plus, look at the dates on the ones I posted,
some are in the same year.

I've only played 4 of them, and , MWF2 was very minimal. MWF, BO, and this are different games, so its not stale to me. If you've been with the franchise for 6-9 games I could see how its lost shine for you. Hopefully I never get there.